Asus P5Q SE PLUS - Manual (Page 40)

1-28 Chapter 1: Product introduction
• The USB device wake-up feature requires a power supply that can provide
500mA on the +5VSB lead for each USB port; otherwise, the system would
not power up.
• The total current consumed must NOT exceed the power supply capability
(+5VSB) whether under normal condition or in sleep mode.
2. Keyboard power (3-pin KBPWR)
This jumper allows you to enable or disable the keyboard wake-up feature.
When you set this jumper to pins 2–3 (+5VSB), you can wake up the
computer by pressing a key on the keyboard (the default is the Space Bar)s.
This feature requires an ATX power supply that can supply at least 1A on the
+5VSB lead, and a corresponding setting in the BIOS.
3. USB device wake-up (3-pin USBPW1-5, 3-pin USBPW6-11)
Set these jumpers to +5V to wake up the computer from S1 sleep mode
(CPU stopped, DRAM refreshed, system running in low power mode) using
the connected USB devices. Set to +5VSB to wake up from S3 and S4 sleep
modes (no power to CPU, DRAM in slow refresh, power supply in reduced
power mode).